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我对 php 相当陌生，目前正在为我的大学开发一个网站。我要做的是创建一个登录页面，允许用户建立与远程 SSH 服务器的连接，然后从 php 运行 linux 脚本。到目前为止，我发现了这段代码——我猜它应该允许用户登录。我试过运行代码，但它似乎不起作用。

编辑：当我运行代码时，页面只是说“函数 ssh2_connect 不存在”。

<?php

if (!function_exists("ssh2_connect")) die("function ssh2_connect doesn't exist");

// log in at server1.example.com on port 22

if(!($con = ssh2_connect("server1.example.com", 22))) {
echo "fail: unable to establish connection\n"; }

else {
// try to authenticate with username and password
if(!ssh2_auth_password($con, "username", "password")) {
    echo "fail: unable to authenticate\n";
}

else {
    // allright, we're in!
    echo "okay: logged in...\n";

    // execute a command
    if (!($stream = ssh2_exec($con, "ls -al" ))) {
        echo "fail: unable to execute command\n";
    }

else {
        // collect returning data from command
        stream_set_blocking($stream, true);
        $data = "";
        while ($buf = fread($stream,4096)) {
            $data .= $buf;
        }
        fclose($stream);
    }
  }
 }
?>
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